Hybrid Tea rose plant named `Delblacrem`

ABSTRACT

A new and distinct variety of Hybrid Tea rose plant is provided that abundantly forms attractive double flowers that are ivory in coloration. The buds are very long in configuration and tend to open slowly. The blossoms exhibit a long vase life. The plant exhibits an upright growth habit, forms vigorous vegetation, and is particularly well suited for greenhouse forcing for cut flower production. Additionally, the plant is resistant to diseases when grown under greenhouse conditions.

SUMMARY OF THE INVENTION

The new variety of Hybrid Tea rose plant was created by artificialpollination wherein two parents were crossed which previously had beenstudied in the hope that they would contribute the desiredcharacteristics. The female parent (i.e., the seed parent) was the`Krilamy` variety (non-patented) in the United States). The male parent(i.e., the pollen parent) was the `Pekougel` variety. The parentage ofthe new variety can be summarized as follows:

    `Krilamy`×`Pekougel`.

The seeds resulting from the above pollination were sown and 382 smallplantlets were obtained which were physically and biologically differentfrom each other. Selective study resulted in the identification of asingle plant of the new variety.

It was found through careful study that the new variety of the presentinvention exhibits the following combination of characteristics:

(a) from a physical point of view forms green mature wood, assumes anupright growth habit, and forms attractive long-lasting ivory doubleflowers having consistent petals, and

(b) from the biological point of view forms vigorous vegetation,produces flowers in abundance, exhibits the ability readily to beforced, and is resistant to diseases when grown under greenhouseconditions.

The new variety well meets the needs of the horticultural industry andis particularly well suited for growing in the greenhouse for theproduction of attractive long-lasting cut flowers that are ivory withpale amber coloration at the center and sometimes with a fine pink lineon the margins depending upon the environmental conditions that areencountered.

The new variety can be readily distinguished from other varieties inview of the combination of characteristics described herein. It exhibitslong and straight stems, rigid and straight peduncles, a good ability tobe forced under greenhouse conditions, and a long vase life for itsdistinctive ivory blossoms.

For instance, the new variety of the present invention can bedistinguished from the `Krilamy` parent, with the new variety exhibitingivory blossoms which convey a pale amber impression and the `Krilamy`variety exhibiting blossoms that are more white. Also, the `Pekougel`parent exhibits pink bicolored blossoms which are totally different incoloration than those of the new variety, as well as a different budconfiguration.

The new variety has been found to undergo asexual propagation and can bereadily reproduced by conventional routes, such as budding (i.e., eyegrafting) and tissue culture. This asexual reproduction by budding andtissue culture as performed at Hyeres, France, has demonstrated that thecharacteristics of the new variety are strictly transmissible from onegeneration to another and are firmly fixed.

The new variety has been named the `Delblacrem` variety.

BRIEF DESCRIPTION OF THE PHOTOGRAPH

The accompanying photograph shows as nearly true as it is reasonablypossible to make the same in a color illustration of this charactertypical specimens of the plant parts of the new variety. The rose plantsof the new variety were grown under glass in the South of France.

FIG. 1--illustrates a specimen of a leaf with five leaflets--planview--upper surface;

FIG. 2--illustrates a specimen of a leaf with five leaflets--planview--under surface;

FIG. 3--illustrates a specimen of a leaf with seven leaflets--planview--upper surface;

FIG. 4--illustrates a specimen of a leaf with seven leaflets--planview--under surface;

FIG. 5--illustrates a specimen of a young shoot;

FIG. 6--illustrates a specimen of a flowering stem;

FIG. 7--illustrates a specimen of a floral bud as the opening of thesepals begins;

FIG. 8--illustrates a specimen of a floral bud as the opening of thesepals progresses;

FIG. 9--illustrates a further specimen of a floral bud as the opening ofthe sepals progresses;

FIG. 10--illustrates a specimen of a floral bud at the opening of thepetals;

FIG. 11--illustrates a specimen of a flower at an early stage in thecourse of opening;

FIG. 12--illustrates a further specimen of a flower in the course ofopening;

FIG. 13--illustrates a specimen of a flower in a further stage ofopening;

FIG. 14--illustrates a specimen of an open flower plan view--obverse;

FIG. 15--illustrates a specimen of an open flower plan view--reverse;

FIG. 16--illustrates a specimen of a fully open flower--planview--reverse;

FIG. 17--illustrates a specimen of a fully open flower--planview--obverse;

FIG. 18--illustrates a specimen of a floral receptacle showing thearrangement of the pistils (stamens removed); and

FIG. 19--illustrates a specimen of a floral receptacle showing thearrangement of the stamens and pistils.

DETAILED DESCRIPTION

The chart used in the identification of the colors is that of The RoyalHorticultural Society (R.H.S. Colour Chart). The description is based onthe observation of plants grown under glass in the South of France. Thecoloration in common terms sometimes also is provided.

Class: Hybrid Tea.

Plant:

Height.--Plants which were pruned to a height of 1 m. produce floralstems having a length of approximately 60 to 120 cm., and an averagelength of approximately 90 cm.

Habit.--Upright.

Branches:

Color.--Young shoots: when approximately 20 cm. long, exhibit a greencoloration, Yellow-Green Group 146C with sometimes reddish coloration onone side depending upon the environment. Floral stems: Yellow-GreenGroup 146C. Mature wood: Yellow-Green Group 146B.

Thorns.--Configuration: concave and nearly straight on the upper edgeand concave on the under edge. Quantity, length and frequency: on atypical stem having a length of 10 cm., there commonly are a few shortprickles of less than 5 mm., and approximately 6 to 10 longer pricklesof more than 5 mm. The prickles commonly are approximately 2 to 13 mm.in length and average approximately 10 mm. in length on floral stems andapproximately 9 mm. in length on mature wood. The stems commonly aresmooth. Color: on young shoots of approximately 30 cm. in length, thethorns are Yellow-Green Group 152D but more pale with some reddishcoloration when cool, and on floral stems the coloration of the thornsis Yellow-Green Group 152D but more pale with reddish coloration whencool, and on mature wood the coloration of the thorns is Greyed-OrangeGroup 165A (havana brown).

Leaves.--Number: typical for the class. Size: medium to large. Stipules:adnate, small to medium, and normal for the class.

Leaflets.--Number: sometimes 3, and commonly 5 or 7. Size: large to verylarge. Shape: obtuse to rounded at the base of the terminal leaflet andslightly cordate at the intersection with the peduncle; slightly concavein the cross-section; and very weak in margin undulation. Serration:present, single, irregular, and not strongly marked. General appearance:thin, weak, with a medium glossiness on the upper surface of theleaflets. Petiole: the inner surface is grooved with non-glandularedges. Petiole color on young shoot: purple with green coloration on theinner surface and Yellow-Green Group 146D on the outer surface. Petiolecolor on floral stem: bronze green coloration on the inner surface andYellow-Green Group 146D on the outer surface. Petiole color on maturewood: Yellow-Green Group 146D on inner surface, and Yellow-Green Group146D on outer surface. Petiole length of terminal leaflet: for a leafhaving five leaflets approximately 12 to 19 mm., approximately 16 mm. onaverage, with a standard deviation of 2 mm. Terminal leaflet length:approximately 53 to 120 mm., approximately 70 mm. on average, with astandard deviation of 15 mm. Terminal leaflet width: approximately 38 to70 mm., approximately 48 mm. on average, with a standard deviation of 10mm. Terminal leaflet shape at base: obtuse to rounded and slightlycordate at the intersection with the petiole. Leaflet color of youngshoot: on the upper surface Green Group 137A in the center with bronzecoloration on the sides and red serration on the tip, and on the undersurface Yellow-Green Group 147B and green with reddish coloration on thetip. Leaflet color on floral stem: Yellow-Green Group 147A on the uppersurface and Yellow-Green Group 148B to 148C on the under surface.Leaflet color of mature wood: Yellow-Green Group 147A to 147B on theupper surface, and Yellow-Green Group 147C on the under surface.

Inflorescence:

Number of Flowers.--Generally one per stem when grown under forcedgreenhouse conditions.

Peduncle.--Erect, stiff, Yellow-Green Group 146B in coloration with somehairs and smooth pink prickles of approximately 2 to 6 mm. in length,and commonly approximately 14 to 17 cm. in length (approximately 15 cm.in length on average).

Sepals.--configuration: there are 5 sepals. Commonly 2 sepals possess noextensions, commonly 2 sepals possess medium-to-long extensions, andcommonly one sepal possesses a very long extension and sometimes evenresembles a leaflet (See, for instance, FIG. 16). The sepal lengthcommonly is 65 mm. on average. Color: Yellow-Green Group 147A on theupper surface and Yellow-Green Group 147B on the under surface.

Buds.--Shape: ovate. Size before calyx breaks: the bud lengths commonlyare approximately 28 to 30 mm., with an average length of approximately28 mm. Color as calyx breaks: commonly 2 petals from the second row areivory with a green coloration and a small pink edge on the margin, andcommonly two other petals from that row are ivory, Yellow Group 11D withsome pinkish coloration. Size after calyx breaks: the bud lengths areapproximately 52 to 70 mm., with an average length of approximately 60mm. Color after calyx breaks: inside: ivory sometimes with pinkishcoloration depending on the light and temperature. outside: ivory,Yellow Group 11D with some pale amber coloration.

Flower.--Time: medium flowering. Shape: double. Form: round toirregularly rounded when viewed from above, convex at the upper partwhen viewed from the side, and convex at the lower part when viewed fromthe side. Diameter: medium to large, approximately 9.5 to 11.5 cm., andapproximately 10 cm. on average, with a standard deviation of 0.5 cm.Petal number: commonly approximately 28 to 40, and an average ofapproximately 35. Petal size (second row from outside): the length isapproximately 52 to 70 mm. with a mean of approximately 56 mm., and astandard deviation of 0.4 mm.; and the width is approximately 56 to 70mm. with a mean of approximately 60 mm., and a standard deviation of 0.4mm. Petal shape: nearly rounded with medium reflexing and mediumundulation of the margin. Petal color: The following description of anearly fully open flower was made while observing a rose grown in thegreenhouse during November which had been undergoing opening for 3 days.Petal color (middle zone): on the inner surface ivory, Yellow Group 11Dto 11C towards the point of attachment, and on the outer surface ivory,Yellow Group 11D. petal color (marginal zone): on the inner surfacewhite sometimes with pinkish coloration, Red Group 49C to 49D dependingupon the temperature and the amount of light, and on the outer surfacewhite sometimes with pinkish coloration Red Group 49C to 49D dependingupon the temperature and the amount of light. Petal spot at base: verysmall. color of spot inner side: Yellow Group 4B. color of spot outerside: extremely small and Yellow Group 4C. Stamens: approximately 45 innumber and are somewhat regularly arranged around the pistils.Filaments: long and Green-Yellow Group 1D in coloration. Anthers: mediumin size, each opens at approximately the same time, and the immaturecoloration is yellow, Yellow-Orange Group 15C. Pollen: sparse inquantity and Yellow Group 4D in coloration. Pistils: approximately 40 innumber. Styles: medium in length and Yellow Group 4D in coloration.Stigmas: Yellow Group 8C, and generally extend to slightly below theheight of the anthers. Hips: in longitudinal section in the shape of apitcher, and approximately 25 mm. in diameter. Seeds: small to medium insize, commonly approximately 10 to 22 in. in number with the averagenumber being approximately 15. Petal drop: petals detach cleanly.Fragrance: light. Lasting quality: long. When cut and placed in a vase,the flowers commonly last approximately 10 to 15 days.

Development:

Vegetation.--Vigorous.

Blooming.--Abundant and almost continuous. Under greenhouse growingconditions at Hyeres, France, approximately 120 blooms commonly areproduced per square meter per year.

Aptitude to forcing.--Good.

Resistance to diseases.--Good under greenhouse conditions, and sensitiveto powdery mildew when grown outdoors.

I claim:
 1. A new and distinct variety of Hybrid Tea rose plantcharacterized by the following combination of characteristics:(a) from aphysical point of view forms green mature wood, assumes an uprightgrowth habit, and forms attractive long-lasting ivory double flowershaving consistent petals, and (b) from the biological point of viewforms vigorous vegetation, produces flowers in abundance, exhibits theability readily to be forced, and is very resistant to diseases whengrown under greenhouse conditions;substantially as herein shown anddescribed.